Grated Yammonsters have the appearance of a light-brown cactus with a propeller-like sprout on the head, striking a taunting pose. The Battle Memory states they are a combination of a baked yam and a toy helicopter, but they are not listed as chimeras.

Like their relatives, they do not roam, but they can rotate 360 degrees to always face the party; they also often guard unopened gift boxes.

Grated Yammonsters have a relatively high HP and Offense. They can cough up phlegm to solidify a target, and also wield PK Freeze β, which can potentially annihilate an unprepared/underleveled party. Their battle theme is the hard-to-combo Back Beat Battle.